If A1,A2,A3,........,an,an+1,......are in A.P. whose common difference is d and S1=A1+A2+A3+........an,S2=an+1+an+2+an+3+........+a2n,S3=a2n+1+a2n+2+a2n+3+.........+a3netc.... Show that S1,S2,S3,.......are in a.p. whose common difference is n^d.
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